201538-20-7Relevant academic research and scientific papers
Synthesis and extraction results of new halide terminated 2-alkyl-p-tert-butylcalix[4]arenes bearing phosphine oxides or ketones on the narrow rim
Menon, Sreejit R.,Schmidt, Joseph A.R.
, p. 767 - 774 (2016)
The synthesis of lower rim tetraphosphorylated and tetraketone calix[4]arenes with haloalkyl groups tethered to a single methylene bridge and their utilization as extraction agents for rare earth elements are reported. Synthesis of these new functionalized calix[4]arene species has been achieved in good to modest yields, and extraction of nine lanthanide nitrates has been explored using these novel calix[4]arene species. The tetraphosphorylated calix[4]arenes show better lanthanide extraction efficiency than their ketone counterparts, especially for europium (III). These experiments demonstrate that inclusion of a substituent tethered to the methylene bridge does not significantly reduce the extraction efficiency of these new calix[4]arene ligands as compared to similar unsubstituted ligands in literature, making them important precursors in the development of functionalized stationary phases for separation of lanthanides. Development of similar CMPO-bearing narrow rims and new solid-phase extraction materials for the solid-liquid separation of lanthanides remains the subject of future work.
Arranging phosphoryl ligands on a calixarene platform
Dieleman, Cedric B.,Matt, Dominique,Jones, Peter G.
, p. 461 - 473 (2007/10/03)
Cone calix[4]arenes substituted at the lower rim by one to four -CH2P(O)Ph2 functionalities have been prepared in moderate to excellent yield, either directly from p-tert-butylcalix[4]arene or piecewise from calix[4]arenes containing easily removable protecting groups. The X-ray structure of a calix[4]arene-derived tris-(phosphine oxide) is presented.
Facile Synthetic Route to Cone-shaped Phosphorylated Calixarenes
Dieleman, Cedric,Loeber, Cyrille,Matt, Dominique,Cian, Andre De,Fisher, Jean
, p. 3097 - 3100 (2007/10/03)
Selective incorporation of one, two or four CH2P(O)Ph2 substituents at specific sites in para-tert-butylcalixarene was achieved using NaH and an appropriate alkylating agent; the tetrasubstituted compound (structure established by X-ray crystallography
